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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m² hr °C
kcal/hr °C
kcal/m²
kcal/m hr °C

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Heat and Mass Transfer
Fouling factor is used

None of these
When a liquid exchanges heat with a gas
In heat exchanger design as a safety factor
In case of Newtonian fluids

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Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

h₁ + h₂ + h₃
None of these
(h₁.h₂.h₃)1/3
1/h₁ + 1/h₂ + 1/h₃

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Heat and Mass Transfer
Planck’s law holds good for

All of these
all coloured bodies
polished bodies
black bodies

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Heat and Mass Transfer
Thermal diffusivity of a substance is

Inversely proportional to specific heat
Inversely proportional to density of substance
Directly proportional to the thermal conductivity
All of these

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Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Wine’s law
Planck’s law
Kirchhoff’s law
Stefan’s law

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